阴山北麓草原生态功能区植被覆盖度遥感动态监测

发布时间：2018-10-07 20:24

【摘要】：为揭示植被覆盖度时空动态变化及其与气候因子的相关关系,以2011年国务院印发的《国家主体功能区规划》中划定的防风固沙类型的阴山北麓草原生态功能区为研究区域,以MODIS长时间序列的植被指数产品为数据源,采用像元二分法、一元线性趋势法以及相关分析法等,对阴山北麓草原生态功能区植被覆盖时空变化及其与气温和降水的关系进行分析.结果表明:阴山北麓草原生态功能区植被覆盖较差,其中以察哈尔右翼中旗的植被覆盖度为最高,数值在30%~60%之间;乌拉特后旗植被覆盖度为最低,处于2.31%~8.89%之间.2000—2010年研究区植被覆盖整体呈波动下降趋势,以低等级(0~20%)和较低等级(20%~40%)为主,两等级面积占90%以上;处于高等级(60%~80%)和较高等级(80%~100%)水平的区域面积总和仅占研究区总面积的0.62%.2000—2010年植被覆盖度由高等级向低等级的转化趋势明显,植被退化面积占研究区总面积的53.4%,植被改善面积仅占1.63%,基本不变的区域占44.97%.相关分析显示,研究区植被覆盖度与同期降水响应关系良好,大部分区域二者呈正相关;植被覆盖度与同期气温关系不明显,大部分区域二者呈负相关,说明降水是影响阴山北麓草原生态功能区植被覆盖度变化的主要自然因素.
[Abstract]:In order to reveal the temporal and spatial dynamic change of vegetation coverage and its correlation with climatic factors, the ecological functional area of the north foot of Yinshan grassland, which was designated as the type of windbreak and sand fixation, was used as the study area in the National main function area Plan issued by the State Council in 2011. The vegetation index product of MODIS long time series is used as data source, and the pixel dichotomy, univariate linear trend method and correlation analysis are used. The temporal and spatial variation of vegetation cover and its relationship with air temperature and precipitation were analyzed in the grassland ecological function area of the northern foot of Yinshan Mountain. The results showed that the vegetation coverage was poor in the grassland ecological function area of the northern foot of Yinshan Mountain, in which the middle flag of Chahar right wing was the highest, the value was between 30% and 60%, and the vegetation coverage degree of the latter flag was the lowest. Between 2.31% and 8.89%. From 2000 to 2010, the whole vegetation cover in the study area showed a fluctuating downward trend, mainly in the low grade (0%) and the lower grade (20%), and the area of the two grades accounted for more than 90%. The total area of the area at the high level (60%) and the higher level (80%) accounted for only 0.622% of the total area of the study area. The trend of vegetation coverage from high grade to low level between 2000 and 2010 was obvious. The area of vegetation degradation accounts for 53.4% of the total area of the study area, the area of vegetation improvement accounts for only 1.63%, and the area basically unchanged accounts for 44.97%. Correlation analysis showed that vegetation coverage had a good relationship with precipitation response in the same period, and there was a positive correlation between vegetation coverage and temperature in most regions, but negative correlation between vegetation coverage and temperature in most regions. It is concluded that precipitation is the main natural factor that affects the vegetation coverage in the grassland ecological function area of Yinshan Mountain.
【作者单位】：中国环境科学研究院;国家环境保护区域生态过程与功能评估重点实验室;井冈山生态环境综合观测研究站;中国科学院遥感与数字地球研究所;
【基金】：环境保护部和中国科学院联合项目(STSN-06)
【分类号】：Q948;TP79

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